HPIPM:Sunflower Seed Maggot

Author: Frank B. Peairs[1]

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Field Biology and Identification

The sunflower seed maggot adult is a small fly about six millimeters (¼ inch) long, with a wingspan of about nine millimeters (3/8 inch). The wings have a brown lace‑like appearance. Mature larvae are about 4.5 millimeters (3/16 inch) in length. Adults emerge during early July and egg deposition occurs on the corolla of incompletely opened sunflower inflorescences. The total larval period is 14 days. There are two generations. The first generation overwinters in the soil as pupae.

Plant Response and Damage

Larval damage is largely dependent upon the state of larval and seed development. Seed sterility occurs when newly hatched larvae tunnel into the corolla of young blooms. Young larvae can destroy up to three seeds during development.

Management Approaches

Significant yield losses have not been demonstrated with this insect. Insecticide treatments are not considered necessary under most conditions.

The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality.